SUPPRESS_WARNINGS ?= 2>&1 | (egrep -v '(AC_TRY_RUN called without default to allow cross compiling|AC_PROG_CXXCPP was called before AC_PROG_CXX|defined in acinclude.m4 but never used|AC_PROG_LEX invoked multiple times|AC_DECL_YYTEXT is expanded from...|the top level)'||true)